<html>
<body>

<script src="ad_iframe_writer.js"></script>

<!-- Should be counted as same-origin even though it's about:contents. -->
<script>
    let adIframe = createAdIframe();
    adIframe.id = "srcdoc_frame_content";
    adIframe.srcdoc = "<html> <img src=pixel.png> </html>"
</script>

</body>
</html>
